Malicious PDF — malware analysis report

Static analysis result for SHA-256 7746cff7d8ddbe70…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 04:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 980d5e731bb0b841f680b807af82dac6 SHA-1: dcc26a1e863d337d7af90b208ce7f64d9ef36b4c SHA-256: 7746cff7d8ddbe70f26295d742384a2853a7b99d4ca06a68ec86b3df1c1e6699
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=android+ru+minecraft PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd0819219---76996016159.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210901225725310.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210910142840.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/tubunoropogibabume.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16148586180609---76620864781.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/42261622294.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149f5b9a0e9f---bozibanovaxixiledijasudel.pdfIn PDF document text
    • http://newworldss.com/uploads/file/nowinaruwoxilejexuteb.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4fb6c513---17229811562.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/wekovepezam.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/magevoxezitureketal.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/nemorabobebabejemu.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/84376293930.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/tenebojexefitokexusob.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049ae735b8---zoruwewovoxiv.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/94255930940.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/86136481076.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/sifiwubipisojetakawixe.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/46f8369249d7a16ba37c193326ce27f9/71223576513.pdfIn PDF document text
    • https://ancoraeducacion.com/images/misamenalejatekofimopok.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/xefixesewuji.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/3158475294.pdfIn PDF document text
    • http://ministerium.pt/files/vuxorawirifaxa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7ED 10504 bytes
SHA-256: 3d5c0f2d934d04a066cf411c532a8aeced98d4db10b386189f0417680ae11aca
font_01_sfnt_off0000cfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 21644 bytes
SHA-256: 6bb0593b028a7c9ee17027327439ce6e420c97ffe6204f94e7bd4144db68955a

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